Liquid-dispensing nozzle



Feb. 8, 1966 K. EHLERs 3,233,641

LIQUID-DISPENS ING NOZZLE Feb. 8, 1966 K. EHU-:Rs 3,233,641

LIQUID-DISPENS ING NOZZLE KARLHE/NZ EHLERS INVBNTOR AGENT United StatesPatent Office 3,233,641 Patented Feb. 8, 1966 Germany My presentinvention relates to liquid-dispensing nozzles of the typedisclosed inmy copending application Ser. No. 273,895, tiled April 18, 1963, ofwhich the present application is a. contimlation-in-part.

Liquid-dispensing nozzles for nondraining hoses generally have apistol-like configuration and are conventionally employed in thedispensing of metered quantities of gasoline or the like to receptaclessuch as the fuel tanks of automotive vehicles and are provided withmeans for automatically cutting off the tlow of liquid through suchnozzles upon the attainment of a predetermined filling level in the`receptacle served thereby. For the most part, such automatic cut-offdevices, which can be generally termed valve means for selectivelyblocking andunblockingthe passage of liquid to ther spigot of thenozzle, are provided with pressure-differential means having an airpassage, the pressure-differential means being operable upon blocking.ofthe air passage by the liquid within the receptacle for controllingthe valve means to cut off ow of liquid to the spigot when thepredetermined liquid level is attained.

Nozzles of this type are usually inserted by the fillingfunctionattendant into the inlet pipe of a receptacle and are permitted toremain there while the attendant occupies himself with other duties.When the liquid level in the receptacle rises to the spigot of thenozzle, the aforementioned air passage is blocked and the receptacleprevented from overiiowing. The air passage of earlier devices wasprovided alongthe outlet spigot in different Ways. ln one construction,a relatively thin wall tube was soldered to the outlet tube of thenozzle along its concave or underside while in other constructions thethin copper tub'ewas clamped to the aluminum outlet. It will be evidentthat elfective functioning of the pressure-differential responsive meansto trip the valve means is essential in order to prevent overflow of thereceptacle with consequent danger to the attendant and property in theregion ofthefuel pump because of the high ammability of the liquiddispensed. Thus the control means must be of such character that, evenwhen the nozzle is overlooked by the attendant, the fuel i'iow will beterminated prior to overovv ofthe tank. With earlier devices of the typedescribed, however, undesirable air passages were readily formed incommunication with the pressure-dilferential responsive means to give afalse indication that the liquid level had not yet been obtained whenthis level had indeedblocked the normal air passage. These undesirablepassages arose from bending and cracking of the thinwalledtube above themouth of the spigot, from loosening of the junction between the spigotand the housing of the nozzle, and from strains at the junction of theairpassage tube and this housing. These diilculties arose from thestrain applied to the spigot after the latter was inserted into the fueltank of a vehicle as a consequence of'the Weight of the nozzle housingand hose, tension on the hose caused by Wind and untimely withdrawal ofthe hose, and accidental forcing of the nozzle in the tank. Moreover,with conventional devices the nozzle frequently slipped out of the tankinlet and was damaged upon striking the ground.

It is the principal feature of the present invention to provide a nozzlefor a liquid-dispensing hose whereby the aforementioned disadvantagescan be avoided.

A further object of this invention is to provide a lnozzle of thecharacter described which will retard accidental withdrawal of thespigot from the receptacle and prevent deformation of the air-passagetube and the development of auxiliary air passages leading to a falseindication that the liquid level has not attained its predeterminedmaximum.

Still another object of the present invention is to extend theprinciples of my aforementioned copending application and provide animproved spigot construction for the novel control mechanism describedtherein.

A further object of the invention is to provide a spigot for a nozzle ofthe character described which has high structural rigidity butwhich canbe formed simplyand inexpensively.

These objects and others which will become apparent hereinafter areattained, in accordance with the present invention, through theprovision of a pistol-like nozzle.

for a dispensing hose which comprises a housing communicating with thehose, valve means in the housing for selectively blocking and unblockingthe passage of liquid therethrough, pressure-differential means forcontrolling the valve means as previously described, and an elongatedspigot, extrusion molded to form an integral arcuate tubular body havingan outlet of relatively large cross-sectional area for the liquid and abore extending along the outlet and constituting the air passage for thepressure differential means. are commonly formed in a single elongatedbody (preferably by extrusion molding) with round annular cross section,the air passage or bore being deiined by a tubular wall portion whosethickness is equal to or greater than the wall thickness of the bodysurrounding the remainder of the outlet. The entire body can, therefore,be monoy metallic with the wall portion surrounding the bore or airpassage simultaneously constituting an inwardly convex ridge extendingalong an interior wall of the outlet preferably along the underside(concave side) thereof and of smoothly curved comiguration merging withthe interior Wall of this outlet. The spigot body can be substantiallycircular in cross-section with the air passage formed in the generallycylindrical outlet wall. The spigot will thus have a high degree ofstilfness, being reinforced by the wall portions surrounding the airpassage along the underside of the body, i.e. the portion thereofresting against the vehicle tank and subjected to most of the bendingstresses applied to the nozzle. In this manner, there is no dangerthatthe air passage will be interrupted or provided with undesirablecommunication with the atmosphere. The smooth configuration of the ridgeprevents the formation of turbulence and foamingin the fuel delivered.This is particularly important when the liquid to be dispensed isgasoline since this liquid foams readly and frequently can rise to thenozzle because of foaming to cut ott the llow of fuel prematurely;laminar iow of the fuel through the spigot is thushighly-desirable.

According to a more specic feature of this invention the underside ofthe spigot body is additionally` strengthene-d by a longitudinallyextending reinforcing rib eX- ternally of the bore and interrupted by aplurality of longitudinally spaced recesses adapted to engage thereceptacle wall and prevent premature withdrawal of the nozzle from thereceptacle. The thickness of the body is increased at this rib so that,even at the recesses, the wall thickness of that portion of the lbodysurrounding the bore is at least equal to the wall thickness of theoutlet portion of the body. The recesses can be formed fby removal ofmaterial from the extrusion-molded body and preferably have theconfiguration of chordal segments. The body can kbe composed of copperor aluminum and formed -by conventional extrusion-molding techniques sothat both the outlet and the passage Will terminate at'the end face ofthe body, the bore then Thus, the air passage and the outlet beingprovided with constriction means adapted to reduce the -cross-section ofthe air passage at its end. The constriction means permits the extrusionmolding of a bore of sufficiently large diameter that finishing will notbe required, but nevertheless having the advantage `of a smalldiameterpassage for purposes of controlling the valve means.

The yabove and other objects, features and advantages of the presentinvention will become more readily apparent from the followingdescription, reference being made -to the accompanying drawing in which:

FIG. l is an axial cross-sectional view of a nozzle embodying theinvention, illustrating the pressure differenti-al and v-alve meansthereof;

FIG. 2 is `a similar view showing the spigot in greater detail;

FIG. 3 is a cross-sectional view taken along line III- III of FIG. 2;and

FIG. 4 is a view similar to FIG. 3 of a modified spigot.

In FIG. l, I show a nozzle in which the valve means andIpressure-differential means are identical with those of myIabove-identified copending application. Thus the nozzle comprises atubular valve housing 1 to whose front end a spigot 2 is secured; therear end of housing 1 has screwed into it a nipple 5 with threads 38 bywhich it can be attached to a nondraining hose 39 of a conventional fuelpump not shown. Nipple S forms a valve seat 3 normally engaged by avalve body 4 which, in the specific embodiment shown in the drawing, isof frustoconical configuration; other, e.g. disk-shaped, types of valvesmay also be used.

A pistol-grip handle 6 is pivotally attached to the exterior -of housing1 by a lever 15a, rigid therewith, which is fulcrumed in the lowerhousing wall by pins 14a. This housing Wall has a bore through which thelever 15a passes and which is sealed against the outside by a fluidtightplug 18 of fuel-resistant rubber or other elastomeric material; plug 18is held in place lby a split ring 19 seated in an annular groove of thehousing wall. Lever 15a is formed with two lateral arms which arereceived in recesses an-d through which the pins 14a pass with-outtraversing either the plug 1S or the main body of lever 15a embracedthereby, hence these ele- Iments need not be perforated. The upper endof lever 15a is received in a slot yof a rod 37 extending axiallywi-thin housing 1, the forward end of this rod also carrying a rod 17forming an abutment for the end of lever 15a.

R-od 37 constitutes the inner one of the tw-o telescoped valve-controlmembers slidably but nonrotatably guided in the housing 1, the outer oneof these members be ing a sleeve 7 which also has a slotted front endstraddling the lever 15a. Sleeve 7 slidably supports the valve body 4 bymeans of a thimble 42 rigid with that sleeve, the valve body 4 having aforward extension projecting into the bore of thimble 42 as Well as Iarearward extension 44 guided in 4a stationary bracket 4S having a vent46. A relatively strong coil spring 8 surrounds the sleeve 7 'and isconfined under pressure -between a flange 13 lof thimble 42 and ashoulder 12 of housing 1; this ange has a rear face defining with thefront face lof valve body 4 a varia-ble clearance 47, a minimumseparation between these two faces being always positively maintained byspacers on the liange 47. A coil spring 9, weaker than spring 8, isseated in thimble 42 and bears -upon valve body 4 so as to urge thelatter rearwardly with reference to sleeve 7 and onto the valve seat. Anannular gasket is inserted between housing 1 and nipple 5 to prevent anyleakage of iluid between the rear end of the nozzle and the hose 39. Thefront end of thimble 42 has an orifice 49 through which the interior ofthe thimble communicates with 4an annular channel formed between thetelescoped Imembers 7 and 37. A further compression spring 36, alsoweaker than spring 8 occupies this channel and tends to maintain themembers 7, 37 in their normal relative position illustrated in FIG. l.

A cylindrical bushing 11 is held in place within housing 1 by the nipple5 and has a forwardly divering inner wall surface in the regionsurrounding the clearance between flange 47 and valve body 4. Theannular space between this wall surface and the sleeve 7, whosecrosssectional area is larger than that of the annular passage formedbetween the valve seat and valve body 4 in any axial position of thelatter, forms part of the path valong which the liquid from hose 39passes through the in terior of housing 1 on its Way to spigot 2. Withinthat spigot this path is constituted -by a relatively Wide fluidchannelS0 `alongside which there extends a relatively nan -row air passage 27terminating in a port 51 at the free end of the spigot. Another port 52in the opposite end of the spigot connects channel 27 with an annularrecess 53 in the tapered front end 70 of nozzle housing 1 from which lapassage 54 leads to the upper compartment 31' of a piston chamber whoselower compartment 31 is separated therefrom by a flexible membrane 26.This membrane, which could be held in position within its chamber in avariety of ways (as, for example, by being formed with a peripheral beadreceived in -an annular groove of the chamber wall), is here shownclamped between an annular shoulder 55 and a cap 32 screwed into theupper compartment 31. An annular gasket 34 `forms a fluid-tight sealbetween the cap 32 and the adjoining part of housing 1.

A Ibolt 33, extending radially of the nozzle housing, centrallytraverses the membrane 26 which is seen to lie parallel to the housingaxis. Bolt 33 is secured to the membrane in airtight Imanner by a nut56; Ithe head of this bolt supports a cage of inverted U-shape, so thatthe latter is limitedly rotatable thereon and also has some play in thedirection of the bolt axis. This relative mobility avoids objectionabledeformation of the merri-1 brane and insures that the cage is freelydisplaceable in' radial direction of the housing, without binding orjamming, in a rectangular lateral aperture 59 of a boss 60 whichsupports a similarly apertured cylindrical liner 61 forming a guidewayfor the axially displaceable sleeve 7.

The cage is provided, at the lower ends of its two sides, with a pair ofslots 25 which extend in longitudinal direction of the telescopedmembers 7, 37 and accommodate a pair of latch rollers 24 for releasablycoupling these members together. Sleeve 7 and rod 37 are formed withlateral recesses which are normally aligned to receive the rollers 24,the longitudinal extent of these recesses being substantially less thanthat of the slots 25 whereby the assembly 7, 37, 25 is axiallydisplaceable from the valveclosing position to the wide-open position inwhich they can be releasably held by a catch 62 on handle 6 engaging anindexing stud 63. The assembly can also be indexed in an intermediateposition, in which liquid can flow at a reduced rate past the valve 4,by the interengagement between catch 62 and another stud 64. A coilspring 30 in a recess of cap 32 bears upon membrane 26 to urge itinwardly under light pressure, thereby tending to maintain the rollers24 engaged in both recesses. The membrane can flex outwardly only so farthat the rollers are lifted out of the inner recess 22 on rod 37.

Cap 32 is provided with two peripheral ports of which one communicateswith the test passage S4 connected with air channel 27 whereas the otherleads to a bore 28 forming part of a low-pressure connection between thespace 31 above the membrane and the valve seat. The latter connectionincludes a peripheral passage 28a between bushing 11 and the adjoininghousing wall as well as a radial passage 29 between that nozzle and thenipple 5. A further low-pressure passage interconnects the space 31"below the membrane 26 and the diverging internal region of the nozzlejust forwardly of the valve seat, this: passage including the clearance47, the orifice 4 9,l the channel housing spring 9, the recess in sleeve7, housing spring -36 and the aperture 59 of boss 60. The last-mentionedpassage, serving to relieve the pressure below the membrane, is alwaysfilled with liquid from the supply hose 39; it will be `noted that thepath between space 31 and the channel of spring 9 is substantiallyinterrupted by the cage in aperture S9 when the cage rests in its bottomposition illustrated in FIG. l.

The operation of the liquiddispensingrnozzle is as follows:

In the cut-olf position shown in FIG. 1, spring 8 is expanded to pressthe valve body 4 against its seat 3 through the intermediaryof sleeve 7.The sleeve and its companion rod 37 are in their normal relative`position in which their recesses `25,22 register witheach other and areinterlinked by the latch rollers 24, the membrane 26, which forms apistonmeans, being dedected downwardly 'by `its biasing spring 3f). Testpassage 27, 54 is open to the atmosphere .and no suction is developedatthe `inlets to the upper and lower membrane compartments 31 31 sinceno liquid flows past the valve 4.

When it is desired to use the nozzle for dispensing fuel from ameteringpump to the tank of a vehicle, the lifting of the nozzle fromits holder on the pump housing actuates the pump motor in theconventional manner so that pressure is built up in the supply hose 39which is filled with liquid. After the forward end of spigot 2 has beeninserted into the inlet of the tank, the operator pulls the handle 6 toswing it counterclockwise about its fulcrum 14a into the rapid-feedposition or into the slow-feediintermediate position in which the detent62 hooks onto the stud64. `The telescoped members 7, 37 -with theirlatch rollers 24 are thereby displaced fully or partly to the left,Within the limits of mobility afforded by the slot of the cage, so thatflange 13 is.retracted `from the valve seat and allows the valve body 4to follow suit under the pressure of the oncoming liquid. Should thepump pressure fail for anyireason, spring 9 would continueto hold thevalve 4 closed so that the liquid in hose 39 cannot drain out.

As the liquid rushespast the inlets 47 and 29 ofthe two low-pressurepassages leading toward the membrane 26, suction is created at theseinletsby the Pitot effect. The suction appliedto low-pressure passage28, 29 and through it to compartment 31 remains ineffectual as long asthe port S1 of spigot 2 is not obstructed by liquid in the gooseneck `ofthe tank. The suction prevailing inthe bleeder passage 35, 49, 47assists the spring 30 in tending to maintain the cage in itsbottomposition in which the sleeve 7 and therod 37 are positively coupledtogether with latch `rollers 24. This condition persists until `theliquid level reaches the port 51 to disconnect air channel 27 andtestpassage 54from the atmosphere. The suction in passage 23, 28a, 29thereupon draws the membrane 26 outwardly, this suction being strongenough to override both the pressure of spring 30 and the partial vacuumin passage 35, 49, 47 in view of the fact that the rate of liquid flowpast the inlet 47 of the latter passage is considerably less than thatat the valve seat 3, i.e. at the inlet 29 communicating with compartment31', by reason of the difference in effective cross-sectional area ofthe ilow path at these two locations. The rollers 24 are thereby liftedout of the recess 22 of rod 37 so that the sleeve 7 is now released fromthe restraining action of lever a and handle 6, being thus free toreturn to its normal position under the urging of its restoring spring8. It should be noted that this return stroke `is cushioned by thespring 36 which is now compressed to bias the handle 6 in a clockwisesense so that the latter will return to its original position (FlG. 1)when the catch 62 is released from its indexing stud 63 or 64. With theclosure of valve 4 upon the restoration of sleeve 7 to normal, the flowof liquid through the nozzle housing 1, 2 is stopped and the suction inchamber 31', 31 ceases. Spring 30 returns the membrane 26 to itsprevious state as soon as the linkage 6, 15a, 37 has been reset by theoperator, the rollers 24 thereupon again latching the members 7 and 37to each other.

As will be evident from FIGS. 2-4, the spigot body 2 is monometallicallyextrusion molded in a single piece (except for the tubular plug 78)`with the outlet 50 of` large cross-sectional area and the air-passagebore 27 of small cross-sectional area, the body being bent in its planeand having the bore 27 extending within the wall of outlet 50 along theunderside ofthe body. The transition along the inner wall of outlet 50and the ridge 71, extending along the tbore 27, is rounded and smooth toensure laminar flow of the liquid through the nozzle. The ridge71 formspart of a wall surrounding the bore 27 and having a wallt-hickness atleast as great as the wall thickness `of the wall 72 defining outlet S0,although the wall of the bore may have a substantiallygreater thickness.The underside of the spigot 2`is also provided with a longitudinallyextending reinforcing rib 73, formed with longitudinally spacedsupporting recesses 74 which constitute notches holding the spigot inplace in the receptacle. These recesses are preferably formed bychip-removal machining operations and can be of chordal segmentalconfiguration as illustratedin FIG. 4.

From FIGS. 3 and 4, it maybe seen that the body of the spigot has agenerally circular annular cross-section and is yof increasedcross-section in the region of bore 27 whicheven at the recesses 12, hasa thickness at least equal to that of the remainder of the body aroundthe outletil. The spigot 2 `can commence with a recess 74', formedbetween the spigot body and the `housings 1, and can have an end portion73 free from recesses to reduce lstresses when the spigot is inserted orremoved fromthe tank. Moreover, the housing 1 preferably tapers toward acylindrical outletportion 75 whose diameter is only slightly greaterthan that of the spigot threaded therein, so that this portion of thehousing can be inserted into the vehicle tank inletif desired, thehousing having a boss `76 engageable with the tank and defining afurther supportingrecess 77 for this purpose.

At the mouth of the spigot, the passage 27 is provided with constrictionmeans orplug 78.forming a small-bore nozzle which `preventsaccumulations of the liquid in the passage and affordsthe latter theadvantages of a narrow bore while permitting it to beV produced as asomewhat largerbore by extrusion. There is no danger that anaccumulation of fuel will wet the attendant upon withdrawal'of thenozzle.

The invention as described and illustrated is believed to admit of manymodifications and variations within the ability of persons skilled inthe art, all such modifications and variations being deemed to beincluded within the spirit and scope of the appended claims.

What is claimed is:

1. A nozzle for a dispensing hose, comprising a housing communicatingwith said hose; a spigot connected with said housing for dischargingliquid fed through said housing from said hose; valve means in saidhousing for selectively blocking and unblocking the passage of liquid tosaid spigot; and pressure-diiierential-responsive means having an airpassage and operable upon blockage of said passage by said liquid forcontrolling said valve means to cut off fiow of said liquid to saidspigot, said spigot comprising an elongated integral tubular body formedwith an outlet of relatively large cross-sectional area for said liquidand with a bore extending along said outlet and constituting saidpassage, said body being of round annular cross-section and having aninwardly convex ridge extending along the wall of said outlet andparalleling said bore, said ridge being of smoothly curved congurationmerging with said Wall, said bore being surrounded by a tubular portionof said body over the entire length of said bore, said tubular portionbeing of a wall thickness at least equal to that of said bodysurrounding said outlet, said body being provided with a reinforcingWall portion of increased thickness monometallically formed on the bodyalong said bore outwardly thereof, said wall portion forming alongitudinally extending rib along the exterior of said body, said ribbeing provided with recesses for supporting said nozzle on a receptacleinlet.

2. A nozzle as defined in claim 1 wherein said recesses include chordalsegmental cut-outs in the round wall of said outlet.

3. A nozzle as defined in claim 1 wherein said rib at a locationproximal to said housing defines ther-ewith a further one of saidrecesses.

4. A nozzle as defined in claim 3 wherein said housing has an outletportion receiving said body, said outlet portion tapering toward saidbody and being of a diameter only slightly greater than that of saidspigot adjacent said body, said outlet portion of said housing beingformed externally with a segmental reinforcing formation along a side ofsaid outlet portion corresponding to the concave side ofsaid body.

5. A nozzle as defined in claim 1 wherein said bore is provided withconstriction means at its end remote from said housing.

6. A nozzle with automatic cutoff for dispensing liquid from anondraining hose, comprising a tubular housing with an open front endand with an open rear end connectable to said hose;

an elongated spigot secured to said front end, said spigot having arelatively wide filling channel comrnunicating with the interior of saidhousing and a relatively narrow air channel extending from a locationwithin said housing to a port opening into the atmosphere near the freeend of said spigot;

pressure-sensitive piston means in a space of said housing separatedfrom said interior;

a valve body axially movable in said interior, said housing beingprovided near its rear end with a constriction forming a valve seat;

a pair of slidably interconnected control members axially movable insaid housing with freedom of limited relative displacement in axialdirection, one of said members bearing said valve body;

first spring means in said housing bearing upon said one of said membersfor urging said valve body against said seat, thereby blocking the flowof liquid through said housing; a handle externally mounted on saidhousing, said handle being provided with an extension projecting intosaid housing, the other of said members being linked with said extensionfor forward displacement away from said valve seat upon movement of saidhandle from a normal position to an off-normal position;

second spring means weaker than said first spring means bearing uponsaid members for tending to maintain them in a predetermined relativeposition;

and latch means in said housing limitedly displaceable in axialdirection yof said housing, said latch -means being simultaneouslyengageable with cooperating formations on both said members in saidpredetermined relative position thereof whereby movement of said handleinto said off-normal position forces said one of said members away fromsaid valve seat and enables the fiow of liquid from said hose to saidspigot, said housing being formed with a first passage extending fromsaid air channel of said spigot to a part of said space on one side ofsaid piston means, said housing being further formed with a secondpassage extending from said part of said space to a point along the flowpath of said liquid through said interior whereby suction due to saidflow becomes effective upon the blocking of said port to displace saidpiston means, said latch means being linked with said piston means fordisengagement from at least one of said formations upon suction-induceddisplacement of said piston means, thereby enabling said first springmeans to restore said one of said members to dow-blocking position, saidspigot comprising an elongated integral tubular body formed with anoutlet of relatively large crosssectional area for said liquid and witha bore extending along said outlet and constituting said air channel,said body being of round annular cross-section and having an inwardlyconvex ridge extending along the wall of said outlet and parallelingsaid bore, said ridge being of smoothly curved configuration mergingwith said wall, said bore being surrounded by a tubular portion of saidbody over the entire length of said bore, said tubular portion being ofa wall thickness at least equal to that of said body surrounding saidoutlet.

References Cited by the Examiner UNITED STATES PATENTS 1,966,082 7/1934Roth et al 141-366 2,217,194 10/1940 Bryce et al.

2,267,623 12/1941 Self et al.

2,309,503 1/1943 Frank 141-209 2,383,949 9/1945 Aronson.

2,622,782 12/1952 Giger 141-209 2,679,967 6/1954 Morrison 141-382 X2,841,191 7/1958 Fraser 141-209 3,101,101 8/1963 Gearhart et al. 141-2093,101,102 8/1963 Gearhart et al 141-209 3,152,623 10/1964 Carriol141-209 LAVERNE D. GE'IGER, Primary Examiner.

1. A NOZZLE FOR A DISPENSING HOSE, COMPRISING A HOUSING COMMUNICATINGWITH SAID HOSE; A SPIGOT CONNECTED WITH SAID HOUSING FOR DISCHARGINGLIQUID FED THROUGH SAID HOUSING FROM SAID HOSE; VALVE MEANS IN SAIDHOUSING FOR SELECTIVELY BLOCKING AND UNBLOCKING THE PASSAGE OF LIQUID TOSAID SPIGOT; AND PRESSURE-DIFFERENTIAL-RESPONSIVE MEANS HAVING AN AIRPASSAGE AND OPERABLE UPON BLOCKAGE OF SAID PASSAGE BY SAID LIQUID FORCONTROLLING SAID VALVE MEANS TO CUT OFF FLOW OF SAID LIQUID TO SAIDSPIGOT, SAID SPIGOT COMPRISING AN ELONGATED INTEGRAL TUBULAR BODY FORMEDWITH AN OUTLET OF RELATIVELY LARGE CROSS-SECTIONAL AREA FOR SAID LIQUIDAND WITH A BORE EXTENDING ALONG SAID OUTLET AND CONSTITUTING SAIDPASSAGE, SAID BODY BEING OF ROUND ANNULAR CROSS-SECTION AND HAVING ANINWARDLY CONVEX RIDGE EXTENDING ALONG THE WALL OF SAID OUTLET ANDPARALLEL-